networking/libiproute/iproute.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4  *
   5  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  * Changes:
   8  *
   9  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  10  * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
  11  */
  12
  13 #include "ip_common.h"  /* #include "libbb.h" is inside */
  14 #include "rt_names.h"
  15 #include "utils.h"
  16
  17 #ifndef RTAX_RTTVAR
  18 #define RTAX_RTTVAR RTAX_HOPS
  19 #endif
  20
  21
  22 struct filter_t {
  23         int tb;
  24         smallint flushed;
  25         char *flushb;
  26         int flushp;
  27         int flushe;
  28         struct rtnl_handle *rth;
  29         //int protocol, protocolmask; - write-only fields?!
  30         //int scope, scopemask; - unused
  31         //int type; - read-only
  32         //int typemask; - unused
  33         //int tos, tosmask; - unused
  34         int iif, iifmask;
  35         int oif, oifmask;
  36         //int realm, realmmask; - unused
  37         //inet_prefix rprefsrc; - read-only
  38         inet_prefix rvia;
  39         inet_prefix rdst;
  40         inet_prefix mdst;
  41         inet_prefix rsrc;
  42         inet_prefix msrc;
  43 } FIX_ALIASING;
  44 typedef struct filter_t filter_t;
  45
  46 #define G_filter (*(filter_t*)&bb_common_bufsiz1)
  47
  48 static int flush_update(void)
  49 {
  50         if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
  51                 bb_perror_msg("can't send flush request");
  52                 return -1;
  53         }
  54         G_filter.flushp = 0;
  55         return 0;
  56 }
  57
  58 static unsigned get_hz(void)
  59 {
  60         static unsigned hz_internal;
  61         FILE *fp;
  62
  63         if (hz_internal)
  64                 return hz_internal;
  65
  66         fp = fopen_for_read("/proc/net/psched");
  67         if (fp) {
  68                 unsigned nom, denom;
  69
  70                 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
  71                         if (nom == 1000000)
  72                                 hz_internal = denom;
  73                 fclose(fp);
  74         }
  75         if (!hz_internal)
  76                 hz_internal = sysconf(_SC_CLK_TCK);
  77         return hz_internal;
  78 }
  79
  80 static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
  81                 struct nlmsghdr *n, void *arg UNUSED_PARAM)
  82 {
  83         struct rtmsg *r = NLMSG_DATA(n);
  84         int len = n->nlmsg_len;
  85         struct rtattr * tb[RTA_MAX+1];
  86         char abuf[256];
  87         inet_prefix dst;
  88         inet_prefix src;
  89         int host_len = -1;
  90         SPRINT_BUF(b1);
  91
  92         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
  93                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
  94                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  95                 return 0;
  96         }
  97         if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
  98                 return 0;
  99         len -= NLMSG_LENGTH(sizeof(*r));
 100         if (len < 0)
 101                 bb_error_msg_and_die("wrong nlmsg len %d", len);
 102
 103         if (r->rtm_family == AF_INET6)
 104                 host_len = 128;
 105         else if (r->rtm_family == AF_INET)
 106                 host_len = 32;
 107
 108         if (r->rtm_family == AF_INET6) {
 109                 if (G_filter.tb) {
 110                         if (G_filter.tb < 0) {
 111                                 if (!(r->rtm_flags & RTM_F_CLONED)) {
 112                                         return 0;
 113                                 }
 114                         } else {
 115                                 if (r->rtm_flags & RTM_F_CLONED) {
 116                                         return 0;
 117                                 }
 118                                 if (G_filter.tb == RT_TABLE_LOCAL) {
 119                                         if (r->rtm_type != RTN_LOCAL) {
 120                                                 return 0;
 121                                         }
 122                                 } else if (G_filter.tb == RT_TABLE_MAIN) {
 123                                         if (r->rtm_type == RTN_LOCAL) {
 124                                                 return 0;
 125                                         }
 126                                 } else {
 127                                         return 0;
 128                                 }
 129                         }
 130                 }
 131         } else {
 132                 if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
 133                         return 0;
 134                 }
 135         }
 136         if (G_filter.rdst.family
 137          && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
 138         ) {
 139                 return 0;
 140         }
 141         if (G_filter.mdst.family
 142          && (r->rtm_family != G_filter.mdst.family
 143             || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
 144             )
 145         ) {
 146                 return 0;
 147         }
 148         if (G_filter.rsrc.family
 149          && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
 150         ) {
 151                 return 0;
 152         }
 153         if (G_filter.msrc.family
 154          && (r->rtm_family != G_filter.msrc.family
 155             || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
 156             )
 157         ) {
 158                 return 0;
 159         }
 160
 161         memset(tb, 0, sizeof(tb));
 162         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 163
 164         if (G_filter.rdst.family
 165          && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
 166         ) {
 167                 return 0;
 168         }
 169         if (G_filter.mdst.family
 170          && G_filter.mdst.bitlen >= 0
 171          && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
 172         ) {
 173                 return 0;
 174         }
 175         if (G_filter.rsrc.family
 176          && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
 177         ) {
 178                 return 0;
 179         }
 180         if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
 181          && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
 182         ) {
 183                 return 0;
 184         }
 185         if (G_filter.flushb
 186          && r->rtm_family == AF_INET6
 187          && r->rtm_dst_len == 0
 188          && r->rtm_type == RTN_UNREACHABLE
 189          && tb[RTA_PRIORITY]
 190          && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
 191         ) {
 192                 return 0;
 193         }
 194
 195         if (G_filter.flushb) {
 196                 struct nlmsghdr *fn;
 197                 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
 198                         if (flush_update())
 199                                 bb_error_msg_and_die("flush");
 200                 }
 201                 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
 202                 memcpy(fn, n, n->nlmsg_len);
 203                 fn->nlmsg_type = RTM_DELROUTE;
 204                 fn->nlmsg_flags = NLM_F_REQUEST;
 205                 fn->nlmsg_seq = ++G_filter.rth->seq;
 206                 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
 207                 G_filter.flushed = 1;
 208                 return 0;
 209         }
 210
 211         if (n->nlmsg_type == RTM_DELROUTE) {
 212                 printf("Deleted ");
 213         }
 214         if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
 215                 printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
 216         }
 217
 218         if (tb[RTA_DST]) {
 219                 if (r->rtm_dst_len != host_len) {
 220                         printf("%s/%u ", rt_addr_n2a(r->rtm_family,
 221                                                 RTA_DATA(tb[RTA_DST]),
 222                                                 abuf, sizeof(abuf)),
 223                                         r->rtm_dst_len
 224                                         );
 225                 } else {
 226                         printf("%s ", format_host(r->rtm_family,
 227                                                 RTA_PAYLOAD(tb[RTA_DST]),
 228                                                 RTA_DATA(tb[RTA_DST]),
 229                                                 abuf, sizeof(abuf))
 230                                         );
 231                 }
 232         } else if (r->rtm_dst_len) {
 233                 printf("0/%d ", r->rtm_dst_len);
 234         } else {
 235                 printf("default ");
 236         }
 237         if (tb[RTA_SRC]) {
 238                 if (r->rtm_src_len != host_len) {
 239                         printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
 240                                                 RTA_DATA(tb[RTA_SRC]),
 241                                                 abuf, sizeof(abuf)),
 242                                         r->rtm_src_len
 243                                         );
 244                 } else {
 245                         printf("from %s ", format_host(r->rtm_family,
 246                                                 RTA_PAYLOAD(tb[RTA_SRC]),
 247                                                 RTA_DATA(tb[RTA_SRC]),
 248                                                 abuf, sizeof(abuf))
 249                                         );
 250                 }
 251         } else if (r->rtm_src_len) {
 252                 printf("from 0/%u ", r->rtm_src_len);
 253         }
 254         if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
 255                 printf("via %s ", format_host(r->rtm_family,
 256                                         RTA_PAYLOAD(tb[RTA_GATEWAY]),
 257                                         RTA_DATA(tb[RTA_GATEWAY]),
 258                                         abuf, sizeof(abuf)));
 259         }
 260         if (tb[RTA_OIF] && G_filter.oifmask != -1) {
 261                 printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 262         }
 263
 264         if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
 265                 /* Do not use format_host(). It is our local addr
 266                    and symbolic name will not be useful.
 267                  */
 268                 printf(" src %s ", rt_addr_n2a(r->rtm_family,
 269                                         RTA_DATA(tb[RTA_PREFSRC]),
 270                                         abuf, sizeof(abuf)));
 271         }
 272         if (tb[RTA_PRIORITY]) {
 273                 printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
 274         }
 275         if (r->rtm_family == AF_INET6) {
 276                 struct rta_cacheinfo *ci = NULL;
 277                 if (tb[RTA_CACHEINFO]) {
 278                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 279                 }
 280                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 281                         if (r->rtm_flags & RTM_F_CLONED) {
 282                                 printf("%c    cache ", _SL_);
 283                         }
 284                         if (ci->rta_expires) {
 285                                 printf(" expires %dsec", ci->rta_expires / get_hz());
 286                         }
 287                         if (ci->rta_error != 0) {
 288                                 printf(" error %d", ci->rta_error);
 289                         }
 290                 } else if (ci) {
 291                         if (ci->rta_error != 0)
 292                                 printf(" error %d", ci->rta_error);
 293                 }
 294         }
 295         if (tb[RTA_IIF] && G_filter.iifmask != -1) {
 296                 printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 297         }
 298         bb_putchar('\n');
 299         return 0;
 300 }
 301
 302 /* Return value becomes exitcode. It's okay to not return at all */
 303 static int iproute_modify(int cmd, unsigned flags, char **argv)
 304 {
 305         static const char keywords[] ALIGN1 =
 306                 "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
 307                 "dev\0""oif\0""to\0""metric\0";
 308         enum {
 309                 ARG_src,
 310                 ARG_via,
 311                 ARG_mtu, PARM_lock,
 312                 ARG_protocol,
 313 IF_FEATURE_IP_RULE(ARG_table,)
 314                 ARG_dev,
 315                 ARG_oif,
 316                 ARG_to,
 317                 ARG_metric,
 318         };
 319         enum {
 320                 gw_ok = 1 << 0,
 321                 dst_ok = 1 << 1,
 322                 proto_ok = 1 << 2,
 323                 type_ok = 1 << 3
 324         };
 325         struct rtnl_handle rth;
 326         struct {
 327                 struct nlmsghdr n;
 328                 struct rtmsg    r;
 329                 char            buf[1024];
 330         } req;
 331         char mxbuf[256];
 332         struct rtattr * mxrta = (void*)mxbuf;
 333         unsigned mxlock = 0;
 334         char *d = NULL;
 335         smalluint ok = 0;
 336         int arg;
 337
 338         memset(&req, 0, sizeof(req));
 339
 340         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 341         req.n.nlmsg_flags = NLM_F_REQUEST | flags;
 342         req.n.nlmsg_type = cmd;
 343         req.r.rtm_family = preferred_family;
 344         if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
 345                 req.r.rtm_table = RT_TABLE_MAIN;
 346         if (RT_SCOPE_NOWHERE)
 347                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
 348
 349         if (cmd != RTM_DELROUTE) {
 350                 req.r.rtm_protocol = RTPROT_BOOT;
 351                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 352                 req.r.rtm_type = RTN_UNICAST;
 353         }
 354
 355         mxrta->rta_type = RTA_METRICS;
 356         mxrta->rta_len = RTA_LENGTH(0);
 357
 358         while (*argv) {
 359                 arg = index_in_substrings(keywords, *argv);
 360                 if (arg == ARG_src) {
 361                         inet_prefix addr;
 362                         NEXT_ARG();
 363                         get_addr(&addr, *argv, req.r.rtm_family);
 364                         if (req.r.rtm_family == AF_UNSPEC)
 365                                 req.r.rtm_family = addr.family;
 366                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 367                 } else if (arg == ARG_via) {
 368                         inet_prefix addr;
 369                         ok |= gw_ok;
 370                         NEXT_ARG();
 371                         get_addr(&addr, *argv, req.r.rtm_family);
 372                         if (req.r.rtm_family == AF_UNSPEC) {
 373                                 req.r.rtm_family = addr.family;
 374                         }
 375                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 376                 } else if (arg == ARG_mtu) {
 377                         unsigned mtu;
 378                         NEXT_ARG();
 379                         if (index_in_strings(keywords, *argv) == PARM_lock) {
 380                                 mxlock |= (1 << RTAX_MTU);
 381                                 NEXT_ARG();
 382                         }
 383                         mtu = get_unsigned(*argv, "mtu");
 384                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 385                 } else if (arg == ARG_protocol) {
 386                         uint32_t prot;
 387                         NEXT_ARG();
 388                         if (rtnl_rtprot_a2n(&prot, *argv))
 389                                 invarg(*argv, "protocol");
 390                         req.r.rtm_protocol = prot;
 391                         ok |= proto_ok;
 392 #if ENABLE_FEATURE_IP_RULE
 393                 } else if (arg == ARG_table) {
 394                         uint32_t tid;
 395                         NEXT_ARG();
 396                         if (rtnl_rttable_a2n(&tid, *argv))
 397                                 invarg(*argv, "table");
 398                         req.r.rtm_table = tid;
 399 #endif
 400                 } else if (arg == ARG_dev || arg == ARG_oif) {
 401                         NEXT_ARG();
 402                         d = *argv;
 403                 } else if (arg == ARG_metric) {
 404                         uint32_t metric;
 405                         NEXT_ARG();
 406                         metric = get_u32(*argv, "metric");
 407                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 408                 } else {
 409                         int type;
 410                         inet_prefix dst;
 411
 412                         if (arg == ARG_to) {
 413                                 NEXT_ARG();
 414                         }
 415                         if ((**argv < '0' || **argv > '9')
 416                          && rtnl_rtntype_a2n(&type, *argv) == 0) {
 417                                 NEXT_ARG();
 418                                 req.r.rtm_type = type;
 419                                 ok |= type_ok;
 420                         }
 421
 422                         if (ok & dst_ok) {
 423                                 duparg2("to", *argv);
 424                         }
 425                         get_prefix(&dst, *argv, req.r.rtm_family);
 426                         if (req.r.rtm_family == AF_UNSPEC) {
 427                                 req.r.rtm_family = dst.family;
 428                         }
 429                         req.r.rtm_dst_len = dst.bitlen;
 430                         ok |= dst_ok;
 431                         if (dst.bytelen) {
 432                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 433                         }
 434                 }
 435                 argv++;
 436         }
 437
 438         xrtnl_open(&rth);
 439
 440         if (d)  {
 441                 int idx;
 442
 443                 ll_init_map(&rth);
 444
 445                 if (d) {
 446                         idx = xll_name_to_index(d);
 447                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 448                 }
 449         }
 450
 451         if (mxrta->rta_len > RTA_LENGTH(0)) {
 452                 if (mxlock) {
 453                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 454                 }
 455                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 456         }
 457
 458         if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
 459                 req.r.rtm_scope = RT_SCOPE_HOST;
 460         else
 461         if (req.r.rtm_type == RTN_BROADCAST
 462          || req.r.rtm_type == RTN_MULTICAST
 463          || req.r.rtm_type == RTN_ANYCAST
 464         ) {
 465                 req.r.rtm_scope = RT_SCOPE_LINK;
 466         }
 467         else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
 468                 if (cmd == RTM_DELROUTE)
 469                         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 470                 else if (!(ok & gw_ok))
 471                         req.r.rtm_scope = RT_SCOPE_LINK;
 472         }
 473
 474         if (req.r.rtm_family == AF_UNSPEC) {
 475                 req.r.rtm_family = AF_INET;
 476         }
 477
 478         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 479                 return 2;
 480         }
 481
 482         return 0;
 483 }
 484
 485 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 486 {
 487         struct {
 488                 struct nlmsghdr nlh;
 489                 struct rtmsg rtm;
 490         } req;
 491         struct sockaddr_nl nladdr;
 492
 493         memset(&nladdr, 0, sizeof(nladdr));
 494         memset(&req, 0, sizeof(req));
 495         nladdr.nl_family = AF_NETLINK;
 496
 497         req.nlh.nlmsg_len = sizeof(req);
 498         if (RTM_GETROUTE)
 499                 req.nlh.nlmsg_type = RTM_GETROUTE;
 500         if (NLM_F_ROOT | NLM_F_REQUEST)
 501                 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
 502         /*req.nlh.nlmsg_pid = 0; - memset did it already */
 503         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
 504         req.rtm.rtm_family = family;
 505         if (RTM_F_CLONED)
 506                 req.rtm.rtm_flags = RTM_F_CLONED;
 507
 508         return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
 509 }
 510
 511 static void iproute_flush_cache(void)
 512 {
 513         static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
 514         int flush_fd = open_or_warn(fn, O_WRONLY);
 515
 516         if (flush_fd < 0) {
 517                 return;
 518         }
 519
 520         if (write(flush_fd, "-1", 2) < 2) {
 521                 bb_perror_msg("can't flush routing cache");
 522                 return;
 523         }
 524         close(flush_fd);
 525 }
 526
 527 static void iproute_reset_filter(void)
 528 {
 529         memset(&G_filter, 0, sizeof(G_filter));
 530         G_filter.mdst.bitlen = -1;
 531         G_filter.msrc.bitlen = -1;
 532 }
 533
 534 /* Return value becomes exitcode. It's okay to not return at all */
 535 static int iproute_list_or_flush(char **argv, int flush)
 536 {
 537         int do_ipv6 = preferred_family;
 538         struct rtnl_handle rth;
 539         char *id = NULL;
 540         char *od = NULL;
 541         static const char keywords[] ALIGN1 =
 542                 /* "ip route list/flush" parameters: */
 543                 "protocol\0" "dev\0"   "oif\0"   "iif\0"
 544                 "via\0"      "table\0" "cache\0"
 545                 "from\0"     "to\0"
 546                 /* and possible further keywords */
 547                 "all\0"
 548                 "root\0"
 549                 "match\0"
 550                 "exact\0"
 551                 "main\0"
 552                 ;
 553         enum {
 554                 KW_proto, KW_dev,   KW_oif,  KW_iif,
 555                 KW_via,   KW_table, KW_cache,
 556                 KW_from,  KW_to,
 557                 /* */
 558                 KW_all,
 559                 KW_root,
 560                 KW_match,
 561                 KW_exact,
 562                 KW_main,
 563         };
 564         int arg, parm;
 565
 566         iproute_reset_filter();
 567         G_filter.tb = RT_TABLE_MAIN;
 568
 569         if (flush && !*argv)
 570                 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
 571
 572         while (*argv) {
 573                 arg = index_in_substrings(keywords, *argv);
 574                 if (arg == KW_proto) {
 575                         uint32_t prot = 0;
 576                         NEXT_ARG();
 577                         //G_filter.protocolmask = -1;
 578                         if (rtnl_rtprot_a2n(&prot, *argv)) {
 579                                 if (index_in_strings(keywords, *argv) != KW_all)
 580                                         invarg(*argv, "protocol");
 581                                 prot = 0;
 582                                 //G_filter.protocolmask = 0;
 583                         }
 584                         //G_filter.protocol = prot;
 585                 } else if (arg == KW_dev || arg == KW_oif) {
 586                         NEXT_ARG();
 587                         od = *argv;
 588                 } else if (arg == KW_iif) {
 589                         NEXT_ARG();
 590                         id = *argv;
 591                 } else if (arg == KW_via) {
 592                         NEXT_ARG();
 593                         get_prefix(&G_filter.rvia, *argv, do_ipv6);
 594                 } else if (arg == KW_table) { /* table all/cache/main */
 595                         NEXT_ARG();
 596                         parm = index_in_substrings(keywords, *argv);
 597                         if (parm == KW_cache)
 598                                 G_filter.tb = -1;
 599                         else if (parm == KW_all)
 600                                 G_filter.tb = 0;
 601                         else if (parm != KW_main) {
 602 #if ENABLE_FEATURE_IP_RULE
 603                                 uint32_t tid;
 604                                 if (rtnl_rttable_a2n(&tid, *argv))
 605                                         invarg(*argv, "table");
 606                                 G_filter.tb = tid;
 607 #else
 608                                 invarg(*argv, "table");
 609 #endif
 610                         }
 611                 } else if (arg == KW_cache) {
 612                         /* The command 'ip route flush cache' is used by OpenSWAN.
 613                          * Assuming it's a synonym for 'ip route flush table cache' */
 614                         G_filter.tb = -1;
 615                 } else if (arg == KW_from) {
 616                         NEXT_ARG();
 617                         parm = index_in_substrings(keywords, *argv);
 618                         if (parm == KW_root) {
 619                                 NEXT_ARG();
 620                                 get_prefix(&G_filter.rsrc, *argv, do_ipv6);
 621                         } else if (parm == KW_match) {
 622                                 NEXT_ARG();
 623                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 624                         } else {
 625                                 if (parm == KW_exact)
 626                                         NEXT_ARG();
 627                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 628                                 G_filter.rsrc = G_filter.msrc;
 629                         }
 630                 } else { /* "to" is the default parameter */
 631                         if (arg == KW_to) {
 632                                 NEXT_ARG();
 633                                 arg = index_in_substrings(keywords, *argv);
 634                         }
 635                         /* parm = arg; - would be more plausible, but we reuse 'arg' here */
 636                         if (arg == KW_root) {
 637                                 NEXT_ARG();
 638                                 get_prefix(&G_filter.rdst, *argv, do_ipv6);
 639                         } else if (arg == KW_match) {
 640                                 NEXT_ARG();
 641                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 642                         } else { /* "to exact" is the default */
 643                                 if (arg == KW_exact)
 644                                         NEXT_ARG();
 645                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 646                                 G_filter.rdst = G_filter.mdst;
 647                         }
 648                 }
 649                 argv++;
 650         }
 651
 652         if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
 653                 do_ipv6 = AF_INET;
 654         }
 655
 656         xrtnl_open(&rth);
 657         ll_init_map(&rth);
 658
 659         if (id || od)  {
 660                 int idx;
 661
 662                 if (id) {
 663                         idx = xll_name_to_index(id);
 664                         G_filter.iif = idx;
 665                         G_filter.iifmask = -1;
 666                 }
 667                 if (od) {
 668                         idx = xll_name_to_index(od);
 669                         G_filter.oif = idx;
 670                         G_filter.oifmask = -1;
 671                 }
 672         }
 673
 674         if (flush) {
 675                 char flushb[4096-512];
 676
 677                 if (G_filter.tb == -1) { /* "flush table cache" */
 678                         if (do_ipv6 != AF_INET6)
 679                                 iproute_flush_cache();
 680                         if (do_ipv6 == AF_INET)
 681                                 return 0;
 682                 }
 683
 684                 G_filter.flushb = flushb;
 685                 G_filter.flushp = 0;
 686                 G_filter.flushe = sizeof(flushb);
 687                 G_filter.rth = &rth;
 688
 689                 for (;;) {
 690                         xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 691                         G_filter.flushed = 0;
 692                         xrtnl_dump_filter(&rth, print_route, NULL);
 693                         if (G_filter.flushed == 0)
 694                                 return 0;
 695                         if (flush_update())
 696                                 return 1;
 697                 }
 698         }
 699
 700         if (G_filter.tb != -1) {
 701                 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 702         } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
 703                 bb_perror_msg_and_die("can't send dump request");
 704         }
 705         xrtnl_dump_filter(&rth, print_route, NULL);
 706
 707         return 0;
 708 }
 709
 710
 711 /* Return value becomes exitcode. It's okay to not return at all */
 712 static int iproute_get(char **argv)
 713 {
 714         struct rtnl_handle rth;
 715         struct {
 716                 struct nlmsghdr n;
 717                 struct rtmsg    r;
 718                 char            buf[1024];
 719         } req;
 720         char *idev = NULL;
 721         char *odev = NULL;
 722         bool connected = 0;
 723         bool from_ok = 0;
 724         static const char options[] ALIGN1 =
 725                 "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
 726
 727         memset(&req, 0, sizeof(req));
 728
 729         iproute_reset_filter();
 730
 731         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 732         if (NLM_F_REQUEST)
 733                 req.n.nlmsg_flags = NLM_F_REQUEST;
 734         if (RTM_GETROUTE)
 735                 req.n.nlmsg_type = RTM_GETROUTE;
 736         req.r.rtm_family = preferred_family;
 737         /*req.r.rtm_table = 0; - memset did this already */
 738         /*req.r.rtm_protocol = 0;*/
 739         /*req.r.rtm_scope = 0;*/
 740         /*req.r.rtm_type = 0;*/
 741         /*req.r.rtm_src_len = 0;*/
 742         /*req.r.rtm_dst_len = 0;*/
 743         /*req.r.rtm_tos = 0;*/
 744
 745         while (*argv) {
 746                 switch (index_in_strings(options, *argv)) {
 747                         case 0: /* from */
 748                         {
 749                                 inet_prefix addr;
 750                                 NEXT_ARG();
 751                                 from_ok = 1;
 752                                 get_prefix(&addr, *argv, req.r.rtm_family);
 753                                 if (req.r.rtm_family == AF_UNSPEC) {
 754                                         req.r.rtm_family = addr.family;
 755                                 }
 756                                 if (addr.bytelen) {
 757                                         addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 758                                 }
 759                                 req.r.rtm_src_len = addr.bitlen;
 760                                 break;
 761                         }
 762                         case 1: /* iif */
 763                                 NEXT_ARG();
 764                                 idev = *argv;
 765                                 break;
 766                         case 2: /* oif */
 767                         case 3: /* dev */
 768                                 NEXT_ARG();
 769                                 odev = *argv;
 770                                 break;
 771                         case 4: /* notify */
 772                                 req.r.rtm_flags |= RTM_F_NOTIFY;
 773                                 break;
 774                         case 5: /* connected */
 775                                 connected = 1;
 776                                 break;
 777                         case 6: /* to */
 778                                 NEXT_ARG();
 779                         default:
 780                         {
 781                                 inet_prefix addr;
 782                                 get_prefix(&addr, *argv, req.r.rtm_family);
 783                                 if (req.r.rtm_family == AF_UNSPEC) {
 784                                         req.r.rtm_family = addr.family;
 785                                 }
 786                                 if (addr.bytelen) {
 787                                         addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
 788                                 }
 789                                 req.r.rtm_dst_len = addr.bitlen;
 790                         }
 791                 }
 792                 argv++;
 793         }
 794
 795         if (req.r.rtm_dst_len == 0) {
 796                 bb_error_msg_and_die("need at least destination address");
 797         }
 798
 799         xrtnl_open(&rth);
 800
 801         ll_init_map(&rth);
 802
 803         if (idev || odev)  {
 804                 int idx;
 805
 806                 if (idev) {
 807                         idx = xll_name_to_index(idev);
 808                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
 809                 }
 810                 if (odev) {
 811                         idx = xll_name_to_index(odev);
 812                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 813                 }
 814         }
 815
 816         if (req.r.rtm_family == AF_UNSPEC) {
 817                 req.r.rtm_family = AF_INET;
 818         }
 819
 820         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 821                 return 2;
 822         }
 823
 824         if (connected && !from_ok) {
 825                 struct rtmsg *r = NLMSG_DATA(&req.n);
 826                 int len = req.n.nlmsg_len;
 827                 struct rtattr * tb[RTA_MAX+1];
 828
 829                 print_route(NULL, &req.n, NULL);
 830
 831                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
 832                         bb_error_msg_and_die("not a route?");
 833                 }
 834                 len -= NLMSG_LENGTH(sizeof(*r));
 835                 if (len < 0) {
 836                         bb_error_msg_and_die("wrong len %d", len);
 837                 }
 838
 839                 memset(tb, 0, sizeof(tb));
 840                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 841
 842                 if (tb[RTA_PREFSRC]) {
 843                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
 844                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
 845                 } else if (!tb[RTA_SRC]) {
 846                         bb_error_msg_and_die("can't connect the route");
 847                 }
 848                 if (!odev && tb[RTA_OIF]) {
 849                         tb[RTA_OIF]->rta_type = 0;
 850                 }
 851                 if (tb[RTA_GATEWAY]) {
 852                         tb[RTA_GATEWAY]->rta_type = 0;
 853                 }
 854                 if (!idev && tb[RTA_IIF]) {
 855                         tb[RTA_IIF]->rta_type = 0;
 856                 }
 857                 req.n.nlmsg_flags = NLM_F_REQUEST;
 858                 req.n.nlmsg_type = RTM_GETROUTE;
 859
 860                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 861                         return 2;
 862                 }
 863         }
 864         print_route(NULL, &req.n, NULL);
 865         return 0;
 866 }
 867
 868 /* Return value becomes exitcode. It's okay to not return at all */
 869 int FAST_FUNC do_iproute(char **argv)
 870 {
 871         static const char ip_route_commands[] ALIGN1 =
 872         /*0-3*/ "add\0""append\0""change\0""chg\0"
 873         /*4-7*/ "delete\0""get\0""list\0""show\0"
 874         /*8..*/ "prepend\0""replace\0""test\0""flush\0";
 875         int command_num;
 876         unsigned flags = 0;
 877         int cmd = RTM_NEWROUTE;
 878
 879         if (!*argv)
 880                 return iproute_list_or_flush(argv, 0);
 881
 882         /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
 883         /* It probably means that it is using "first match" rule */
 884         command_num = index_in_substrings(ip_route_commands, *argv);
 885
 886         switch (command_num) {
 887                 case 0: /* add */
 888                         flags = NLM_F_CREATE|NLM_F_EXCL;
 889                         break;
 890                 case 1: /* append */
 891                         flags = NLM_F_CREATE|NLM_F_APPEND;
 892                         break;
 893                 case 2: /* change */
 894                 case 3: /* chg */
 895                         flags = NLM_F_REPLACE;
 896                         break;
 897                 case 4: /* delete */
 898                         cmd = RTM_DELROUTE;
 899                         break;
 900                 case 5: /* get */
 901                         return iproute_get(argv+1);
 902                 case 6: /* list */
 903                 case 7: /* show */
 904                         return iproute_list_or_flush(argv+1, 0);
 905                 case 8: /* prepend */
 906                         flags = NLM_F_CREATE;
 907                         break;
 908                 case 9: /* replace */
 909                         flags = NLM_F_CREATE|NLM_F_REPLACE;
 910                         break;
 911                 case 10: /* test */
 912                         flags = NLM_F_EXCL;
 913                         break;
 914                 case 11: /* flush */
 915                         return iproute_list_or_flush(argv+1, 1);
 916                 default:
 917                         bb_error_msg_and_die("unknown command %s", *argv);
 918         }
 919
 920         return iproute_modify(cmd, flags, argv+1);
 921 }